Biomass fuels have more complex characteristics than fossil fuels; and their different physical and chemical characteristics can lead to situations such as heavy slag buildup or unstable combustion. This results in a high amount of unburnt fuel in the ash. For complex fuels and special equipment requirements, boiler dynamics need to be very specifically designed and DP’s expert engineering team uses advanced CFD modeling to optimize the boiler design. Air flow and temperature distribution in the combustion chamber; as well as the emission concentration (NOx and SOx) are simulated in order to optimize the boiler design.